2. Sample Papers
  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-19

  • question_answer
    In \[''Al''\] and \[''Si''\]. If temperature is changed from normal temperature to 70 K then

    A)  The resistance of \[Al\] will increase and that of \[Si\] will decrease

    B)  The resistance of \[Al\] will decrease and that of \[Si\] will increase

    C)  Resistance of both decrease

    D)  Resistnance of both increase

    Correct Answer: B

    Solution :

     \[T\downarrow \] (\[300K\] to \[70K\]) \[T\downarrow \underset{(Al)}{\mathop{{{R}_{metal}}}}\,\downarrow \underset{(Si)}{\mathop{R}}\,\uparrow \]semi - conductor


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